tl;dr I made a CTF team anyone can join that wants to play with others remotely.
One of the things you're guaranteed to be ask when you go to a security conference is, "Do you play CTFs?" If the answer is no you feel like a chump. You can get good at CTFs on your own (I haven't yet) but it'll be easier and more fun to get over the learning curve if you join us.
If you're new to CTF or just suck like I do have a look at this (and maybe this (read up to the networking chapter) then this too.) Be sure to have a Ubuntu and Windows VM as well.